From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:42238) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R3ki6-0005PH-7f for qemu-devel@nongnu.org; Wed, 14 Sep 2011 04:20:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1R3ki5-0001jU-6v for qemu-devel@nongnu.org; Wed, 14 Sep 2011 04:20:46 -0400 Received: from david.siemens.de ([192.35.17.14]:19072) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R3ki4-0001i6-Sf for qemu-devel@nongnu.org; Wed, 14 Sep 2011 04:20:45 -0400 Message-ID: <4E7063D9.3040803@siemens.com> Date: Wed, 14 Sep 2011 10:20:41 +0200 From: Jan Kiszka MIME-Version: 1.0 References: <3d9d904a1e4939a147f8954c9e0d4cdaf3d44c31.1314033132.git.jan.kiszka@siemens.com> <4E6E2329.9050109@suse.de> <4E6E2631.4060300@siemens.com> <4E6E28FD.7070907@web.de> <4E6E2A06.8010900@siemens.com> <4E6E2BDC.3060702@siemens.com> <4E6F10DD.6060606@siemens.com> <6BA6355D-D77A-40F4-A8C4-61901A926E71@suse.de> <4E6F1BAF.2000105@siemens.com> <2A74238E-5C89-444B-9DB9-4B380D182AC3@suse.de> <4E6F3FB8.6060705@siemens.com> <4E7053A3.8090508@redhat.com> <4E706303.9040502@redhat.com> In-Reply-To: <4E706303.9040502@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: Anthony Liguori , qemu-devel , Alexander Graf , Blue Swirl , =?ISO-8859-1?Q?Andreas_F=E4rber?= , Gerd Hoffmann On 2011-09-14 10:17, Avi Kivity wrote: > On 09/14/2011 10:42 AM, Alexander Graf wrote: >> On 14.09.2011, at 09:11, Avi Kivity wrote: >> >>> On 09/13/2011 10:39 PM, Blue Swirl wrote: >>>> > >>>> > Here is the problem: Both the vram and the ISA range get mapped into >>>> > system address space, but the former eclipses the latter as it shows up >>>> > earlier in the list and has the same priority. This picture changes with >>>> > the chain-4 alias which has prio 2, thus maps over the vram. >>>> > >>>> > It looks to me like the ISA address space is either misplaced at >>>> > 0x80000000 or is not supposed to be mapped at all on PPC. Comments? >>>> >>>> Since there is no PCI-ISA bridge, ISA address space shouldn't exist. >>> >>> Where does the vga device sit then? >> >> On the PCI bus? :) >> > > I thought it was std vga, which is an ISA device. There are both types (ISA-only and PCI). > > Anyway PCI supports the vga region at 0xa0000-0xc0000. Where is it > supposed to be mapped? ...but not all PCI bridges make use of this feature / forward legacy requests. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux